Yesterday my 13 year old step daughter was home from school and around noon her mother left for a doctors appt. My step daughter is very developed for her age, big tits and gorgeous legs and butt and long brown hair. We were on the couch watching tv and she was wearing a tshirt and loose shorts under a blanket and sitting right up next to me. When her mother left she spread her legs under the blanket and began masturbating while we watched tv. It was plain to see what her hand was doing under there as the blanket wasnt very thick... I was instantly hard. Then she moved so she was laying on the couch facing me with her feet near my leg, all the while spread under that blanked and wanking herself.

i put my hand in my pocket and rubbed my cock then just took my hand out of my pocked and rubbed my cock through my jeans so she could plainly see. We did that for a little while until she came. She got up and went to the bathroom and after that we just went back to acting normal and her mom came home about an hour after that.

This isnt the first time this kind of thing has happened.. a few months ago while her mom was at work we were laying on my bed watching tv and she masturbated under the blanket next to me for a while until she arched her back and came.

I know its wrong but I want this to happen more. It was really hard not to just pull my dick out and jerk off with her until I blew my load all over.